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Coordinating, Developing, and Delivering Highway Transportation Innovations

 
REPORT
This report is an archived publication and may contain dated technical, contact, and link information
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Publication Number:  FHWA-HRT-14-057    Date:  February 2018
Publication Number: FHWA-HRT-14-057
Date: February 2018

 

Safety Evaluation of Access Management Policies and Techniques

APPENDIX D. SUMMARY STATISTICS BY LAND USE AND REGION

Appendix D provides a summary of each variable by land use and region in table 75 through table 86. The following summary statistics are used in aspects of the model application, such as default values for the models:

MIXED-USE

Table 75. Summary statistics for North Carolina mixed-use land use.

Variable Name Variable Description Corridors Minimum Maximum Mean St. Dev.
Total Total crashes/mile-year 26 5.85 65.15 28.55 17.01
Injury Injury crashes/mile-year 26 0.69 19.35 7.81 4.57
Turning Turning crashes/mile-year 26 1.26 14.44 5.24 4.17
Rear-end Rear-end crashes/mile-year 26 1.38 33.84 13.29 9.34
Right-angle Right-angle crashes/mile-year 26 0.34 11.11 3.61 2.97
PROPLANE1 Proportion of total length with two lanes 26 0.00 0.76 0.07 0.20
PROPLANE2 Proportion of total length with three or four lanes 26 0.00 1.00 0.82 0.29
PROPLANE3 Proportion of total length with five or more lanes 26 0.00 1.00 0.11 0.24
PROPDIV Proportion of total length with curb or raised concrete median 26 0.00 1.00 0.63 0.42
PROPTWLTL Proportion of total length with a TWLTL 26 0.00 1.00 0.30 0.42
PROPUNDIV Proportion of total length with an undivided median 26 0.00 0.76 0.07 0.20
PROPNODEV Proportion of total length with no adjacent development 26 0.00 1.00 0.10 0.28
PROPPARTDEV Proportion of total length with partial adjacent development 26 0.00 1.00 0.90 0.28
PROPFULLDEV Proportion of total length with full adjacent development 26 0.00 0.00 0.00 0.00
PROPLIGHT Proportion of total length with illumination present 26 0.00 1.00 0.85 0.35
PROPPOORPVMNT Proportion of total length with a poor pavement condition 26 0.00 1.00 0.05 0.20
PROPVC Proportion of total length with visual clutter 26 0.00 1.00 0.06 0.20
PROPLIMCONN Proportion of total length with limited connectivity on adjacent developments 26 0.00 1.00 0.23 0.35
PROPMODCONN Proportion of total length with moderate connectivity on adjacent developments 26 0.00 1.00 0.21 0.34
PROPSIGCONN Proportion of total length with significant connectivity on adjacent developments 26 0.00 1.00 0.56 0.44
PROPFRONTRD Proportion of total length with a frontage road 26 0.00 0.11 0.01 0.02
DRWYDENS Number of driveways per mile 26 1.47 38.93 12.85 10.23
UNSIGDENS Number of unsignalized intersections per mile 26 0.75 10.48 5.35 2.62
ACCDENS Number of driveways plus unsignalized intersections per mile 26 2.26 46.92 18.20 11.96
SIGDENS Number of signalized intersections per mile 26 0.73 4.74 2.45 1.10
MEDOPDENS Number of median openings per mile 24 0.00 4.72 1.61 1.43
NODRWYS Number of driveways 26 3.00 112.00 28.31 29.16
NOCOMFULLDRWY Number of commercial full-movement driveways 26 0.00 69.00 6.19 14.13
NORESFULLDRWY Number of residential full-movement driveways 26 0.00 88.00 9.04 17.54
NOCOMLIMDRWY Number of commercial limited-movement driveways 26 0.00 20.00 6.54 6.24
NORESLIMDRWY Number of residential limited-movement driveways 26 0.00 40.00 6.54 12.01
NOUNSIG Number of unsignalized intersections 26 2.00 31.00 10.69 6.39
NO3LEGUNSIG Number of 3-legged unsignalized intersections 26 1.00 27.00 7.77 5.46
NO4LEGUNSIG Number of 4-legged unsignalized intersections 26 0.00 14.00 2.92 3.14
NO5LEGUNSIG Number of 5-legged unsignalized intersections 26 0.00 0.00 0.00 0.00
NO3LEGFULLUNSIG Number of 3-legged full-movement unsignalized intersections 26 0.00 25.00 5.31 5.42
NO3LEGLIMUNSIG Number of 3-legged limited-movement unsignalized intersections 26 0.00 9.00 2.88 2.30
NO3LEGRIROUNSIG Number of 3-legged right-in/right-out unsignalized intersections 26 0.00 8.00 2.81 2.19
NO3LEGLFMOUNSIG Number of 3-legged unsignalized intersections with no left-turn movement from crossroad 26 0.00 1.00 0.08 0.27
NO4LEGFULLUNSIG Number of 4-legged full-movement unsignalized intersections 26 0.00 7.00 2.12 1.99
NO4LEGLIMUNSIG Number of 4-legged limited-movement unsignalized intersections 26 0.00 2.00 0.27 0.67
NO4LEGRIROUNSIG Number of 4-legged right-in/right-out unsignalized intersections 26 0.00 1.00 0.08 0.27
NO4LEGLFMOUNSIG Number of 4-legged unsignalized intersections with no left-turn movement from crossroad 26 0.00 2.00 0.19 0.49
NORTLUNSIG Number of unsignalized intersections with a right-turn lane 26 0.00 9.00 1.77 2.18
NOLTLUNSIG Number of unsignalized intersections with a left-turn lane 26 0.00 29.00 7.08 6.90
NOSIG Number of signalized intersections 26 1.00 14.00 5.04 2.86
MINSPCSIG Minimum spacing of signalized intersections (feet) 25 442.00 4,846.00 1,532.00 1,107.00
MAXSPCSIG Maximum spacing of signalized intersections (feet) 25 1,142.00 14,810.00 4,456.00 2,642.00
NO3LEGSIG Number of 3-legged signalized intersections 26 0.00 3.00 0.85 0.88
NO4LEGSIG Number of 4-legged signalized intersections 26 1.00 12.00 4.12 2.58
NO5LEGSIG Number of 5-legged signalized intersections 26 0.00 1.00 0.08 0.27
NORTLSIG Number of signalized intersections with a right-turn lane on the mainline 26 0.00 9.00 2.85 2.05
NOLTLSIG Number of signalized intersections with a left-turn lane on the mainline 26 1.00 14.00 4.77 2.80
NOMEDOP Number of median openings 24 0.00 15.00 3.54 3.88
MEDOPLT Number of median openings with a left-turn lane 24 0.00 12.00 3.25 3.26
MEDOPNOLT Number of median openings without a left-turn lane 24 0.00 5.00 0.29 1.08
SPEED_LIMIT Posted speed limit (miles per hour) 26 35.00 55.00 46.00 4.08
AVGAADT Average AADT 26 3,100.00 40,428 19,806.00 8,679.00
SPCOFFLT Minimum spacing from off-ramp to available left turn onto mainline from same side of road (feet) 10 379.00 1,265.00 676.00 287.27
SPCOFFRT Minimum spacing from off-ramp to available right turn onto mainline from same side of road (feet) 10 281.00 1,265.00 647.00 312.34
SPCON Minimum spacing from on-ramp to available right turn onto mainline from same side of road (feet) 11 0.00 1,939.00 646.00 625.47
St. Dev. = standard deviation; TWLTL = two-way left-turn lane.

 

Table 76. Summary statistics for Minnesota mixed-use land use.

Variable Name Variable Description Corridors Minimum Maximum Mean St. Dev.
Total Total crashes/mile-year 18 7.22 105.94 38.81 28.87
Injury Injury crashes/mile-year 18 1.90 40.05 12.66 10.43
Turning Turning crashes/mile-year 18 0.09 10.16 2.92 2.73
Rear-end Rear-end crashes/mile-year 18 1.67 67.83 17.87 19.15
Right-angle Right-angle crashes/mile-year 18 1.30 22.95 7.05 5.47
PROPLANE1 Proportion of total length with two lanes 18 0.00 1.00 0.21 0.33
PROPLANE2 Proportion of total length with three or four lanes 18 0.00 1.00 0.79 0.33
PROPLANE3 Proportion of total length with five or more lanes 18 0.00 0.00 0.00 0.00
PROPDIV Proportion of total length with curb or raised concrete median 18 0.00 1.00 0.61 0.43
PROPTWLTL Proportion of total length with a TWLTL 18 0.00 0.73 0.10 0.23
PROPUNDIV Proportion of total length with an undivided median 18 0.00 1.00 0.29 0.40
PROPNODEV Proportion of total length with no adjacent development 18 0.00 0.14 0.01 0.03
PROPPARTDEV Proportion of total length with partial adjacent development 18 0.00 1.00 0.85 0.28
PROPFULLDEV Proportion of total length with full adjacent development 18 0.00 1.00 0.14 0.29
PROPLIGHT Proportion of total length with illumination present 18 0.00 1.00 0.57 0.48
PROPPOORPVMNT Proportion of total length with a poor pavement condition 18 0.00 1.00 0.10 0.26
PROPVC Proportion of total length with visual clutter 18 0.00 1.00 0.28 0.35
PROPLIMCONN Proportion of total length with limited connectivity on adjacent developments 18 0.37 1.00 0.77 0.21
PROPMODCONN Proportion of total length with moderate connectivity on adjacent developments 18 0.00 0.63 0.23 0.21
PROPSIGCONN Proportion of total length with significant connectivity on adjacent developments 18 0.00 0.00 0.00 0.00
PROPFRONTRD Proportion of total length with a frontage road 18 0.12 1.00 0.70 0.31
DRWYDENS Number of driveways per mile 18 0.00 43.56 16.03 14.65
UNSIGDENS Number of unsignalized intersections per mile 18 0.80 14.93 6.75 4.81
ACCDENS Number of driveways plus unsignalized intersections per mile 18 1.07 58.49 22.79 19.03
SIGDENS Number of signalized intersections per mile 18 0.76 6.78 2.93 1.46
MEDOPDENS Number of median openings per mile 14 0.00 4.46 1.47 1.45
NODRWYS Number of driveways 18 0.00 127.00 37.11 39.23
NOCOMFULLDRWY Number of commercial full-movement driveways 18 0.00 0.71 22.00 26.89
NORESFULLDRWY Number of residential full-movement driveways 18 0.00 38.00 7.89 12.16
NOCOMLIMDRWY Number of commercial limited-movement driveways 18 0.00 31.00 6.11 10.37
NORESLIMDRWY Number of residential limited-movement driveways 18 0.00 6.00 1.11 1.91
NOUNSIG Number of unsignalized intersections 18 2.00 45.00 15.44 11.83
NO3LEGUNSIG Number of 3-legged unsignalized intersections 18 1.00 23.00 10.28 6.47
NO4LEGUNSIG Number of 4-legged unsignalized intersections 18 0.00 22.00 5.00 6.48
NO5LEGUNSIG Number of 5-legged unsignalized intersections 18 0.00 1.00 0.11 0.32
NO3LEGFULLUNSIG Number of 3-legged full-movement unsignalized intersections 18 0.00 18.00 6.28 6.29
NO3LEGLIMUNSIG Number of 3-legged limited-movement unsignalized intersections 18 0.00 12.00 4.00 4.00
NO3LEGRIROUNSIG Number of 3-legged right-in/right-out unsignalized intersections 18 0.00 11.00 3.44 3.58
NO3LEGLFMOUNSIG Number of 3-legged unsignalized intersections with no left-turn movement from crossroad 18 0.00 2.00 0.56 0.70
NO4LEGFULLUNSIG Number of 4-legged full-movement unsignalized intersections 18 0.00 22.00 5.00 6.48
NO4LEGLIMUNSIG Number of 4-legged limited-movement unsignalized intersections 18 0.00 0.00 0.00 0.00
NO4LEGRIROUNSIG Number of 4-legged right-in/right-out unsignalized intersections 18 0.00 0.00 0.00 0.00
NO4LEGLFMOUNSIG Number of 4-legged left from major only unsignalized intersections 18 0.00 0.00 0.00 0.00
NORTLUNSIG Number of unsignalized intersections with a right-turn lane 18 0.00 11.00 3.39 3.29
NOLTLUNSIG Number of unsignalized intersections with a left-turn lane 18 0.00 29.00 7.44 8.49
NOSIG Number of signalized intersections 18 2.00 17.00 7.39 4.20
MINSPCSIG Minimum spacing of signalized intersections (feet) 18 250.00 5,285.00 1,160.00 1,303.00
MAXSPCSIG Maximum spacing of signalized intersections (feet) 18 299.00 9,744.00 3,635.00 2,057.00
NO3LEGSIG Number of 3-legged signalized intersections 18 0.00 4.00 1.00 1.41
NO4LEGSIG Number of 4-legged signalized intersections 18 2.00 17.00 6.28 3.85
NO5LEGSIG Number of 5-legged signalized intersections 18 0.00 2.00 0.11 0.47
NORTLSIG Number of signalized intersections with a right-turn lane on the mainline 18 1.00 10.00 4.39 3.07
NOLTLSIG Number of signalized intersections with a left-turn lane on the mainline 18 0.00 14.00 6.11 3.72
NOMEDOP Number of median openings 14 0.00 16.00 4.07 4.21
NOMEDOPLT Number of median openings with a left-turn lane 14 0.00 16.00 3.71 4.03
NOMEDOPNOLT Number of median openings without a left-turn lane 14 0.00 3.00 0.36 0.93
SPEED_LIMIT Posted speed limit (miles per hour) 18 30.00 60.00 42.00 10.18
AVGAADT Average AADT 18 7,561.00 42,903.00 23,787.00 9,806.00
SPCOFFLT Minimum spacing from off-ramp to available left turn onto mainline from same side of road (feet) 9 142.00 2,640.00 1,121.00 784.00
SPCOFFRT Minimum spacing from off-ramp to available right turn onto mainline from same side of road (feet) 9 142.00 2,640.00 1,121.00 784.00
SPCON Minimum spacing from on-ramp to available right turn onto mainline from same side of road (feet) 9 70.00 1,671.00 710.00 587.00
St. Dev. = standard deviation; TWLTL = two-way left-turn lane.

 

Table 77. Summary statistics for Northern California mixed-use land use.

Variable Name Variable Description Corridors Minimum Maximum Mean St. Dev.
Total Total crashes/mile-year 20 0.18 41.16 18.49 14.12
Injury Injury crashes/mile-year 20 0.09 19.56 8.66 6.30
Turning Turning crashes/mile-year 20 0.09 13.81 4.70 4.46
Rear-end Rear-end crashes/mile-year 20 0.09 21.12 8.44 7.05
Right-angle Right-angle crashes/mile-year 20 0.00 5.05 1.70 1.49
PROPLANE1 Proportion of total length with two lanes 20 0.00 1.00 0.15 0.32
PROPLANE2 Proportion of total length with three or four lanes 20 0.00 1.00 0.44 0.44
PROPLANE3 Proportion of total length with five or more lanes 20 0.00 1.00 0.41 0.46
PROPDIV Proportion of total length with curb or raised concrete median 20 0.00 1.00 0.61 0.42
PROPTWLTL Proportion of total length with a TWLTL 20 0.00 0.68 0.10 0.20
PROPUNDIV Proportion of total length with an undivided median 20 0.00 1.00 0.29 0.37
PROPNODEV Proportion of total length with no adjacent development 20 0.00 0.54 0.03 0.12
PROPPARTDEV Proportion of total length with partial adjacent development 20 0.00 1.00 0.61 0.45
PROPFULLDEV Proportion of total length with full adjacent development 20 0.00 1.00 0.36 0.45
PROPLIGHT Proportion of total length with illumination present 20 0.00 1.00 0.76 0.37
PROPPOORPVMNT Proportion of total length with a poor pavement condition 20 0.00 1.00 0.07 0.23
PROPVC Proportion of total length with visual clutter 20 0.00 1.00 0.20 0.38
PROPLIMCONN Proportion of total length with limited connectivity on adjacent developments 20 0.00 1.00 0.30 0.39
PROPMODCONN Proportion of total length with moderate connectivity on adjacent developments 20 0.00 1.00 0.42 0.39
PROPSIGCONN Proportion of total length with significant connectivity on adjacent developments 20 0.00 1.00 0.28 0.37
PROPFRONTRD Proportion of total length with a frontage road 20 0.00 1.00 0.32 0.33
DRWYDENS Number of driveways per mile 20 0.00 108.53 42.70 26.19
UNSIGDENS Number of unsignalized intersections per mile 20 1.03 13.31 7.06 4.24
ACCDENS Number of driveways plus unsignalized intersections per mile 20 1.98 109.56 49.76 27.96
SIGDENS Number of signalized intersections per mile 20 0.22 6.74 4.02 1.73
MEDOPDENS Number of median openings per mile 20 0.00 4.67 1.47 1.58
NODRWYS Number of driveways 20 0.00 420.00 100.00 90.08
NOCOMFULLDRWY Number of commercial full-movement driveways 20 0.00 81.00 20.15 27.38
NORESFULLDRWY Number of residential full-movement driveways 20 0.00 76.00 13.15 21.29
NOCOMLIMDRWY Number of commercial limited-movement driveways 20 0.00 186.00 44.10 47.96
NORESLIMDRWY Number of residential limited-movement driveways 20 0.00 382.00 22.60 84.74
NOUNSIG Number of unsignalized intersections 20 2.00 36.00 14.75 10.55
NO3LEGUNSIG Number of 3-legged unsignalized intersections 20 1.00 33.00 11.76 8.78
NO4LEGUNSIG Number of 4-legged unsignalized intersections 20 0.00 28.00 3.00 6.16
NO5LEGUNSIG Number of 5-legged unsignalized intersections 20 0.00 0.00 0.00 0.00
NO3LEGFULLUNSIG Number of 3-legged full-movement unsignalized intersections 20 0.00 22.00 5.35 5.48
NO3LEGLIMUNSIG Number of 3-legged limited-movement unsignalized intersections 20 0.00 22.00 6.40 6.57
NO3LEGRIROUNSIG Number of 3-legged right-in/right-out unsignalized intersections 20 0.00 22.00 6.15 6.14
NO3LEGLFMOUNSIG Number of 3-legged unsignalized intersections with no left-turn movement from crossroad 20 0.00 3.00 0.25 0.72
NO4LEGFULLUNSIG Number of 4-legged full-movement unsignalized intersections 20 0.00 28.00 2.95 6.19
NO4LEGLIMUNSIG Number of 4-legged limited-movement unsignalized intersections 20 0.00 1.00 0.05 0.22
NO4LEGRIROUNSIG Number of 4-legged right-in/right-out unsignalized intersections 20 0.00 1.00 0.05 0.22
NO4LEGLFMOUNSIG Number of 4-legged unsignalized intersections with no left-turn movement from crossroad 20 0.00 0.00 0.00 0.00
NORTLUNSIG Number of unsignalized intersections with a right-turn lane 20 0.00 4.00 0.85 1.35
NOLTLUNSIG Number of unsignalized intersections with a left-turn lane 20 0.00 20.00 4.85 5.19
NOSIG Number of signalized intersections 20 1.00 24.00 9.15 6.23
MINSPCSIG Minimum spacing of signalized intersections (feet) 19 231.00 1,755.00 678.00 440.00
MAXSPCSIG Maximum spacing of signalized intersections (feet) 19 1,181.00 6,094.00 2,481.00 1,232.00
NO3LEGSIG Number of 3-legged signalized intersections 20 0.00 7.00 2.25 2.15
NO4LEGSIG Number of 4-legged signalized intersections 20 1.00 20.00 6.70 5.12
NO5LEGSIG Number of 5-legged signalized intersections 20 0.00 2.00 0.15 0.49
NORTLSIG Number of signalized intersections with a right-turn lane on the mainline 20 0.00 7.00 2.30 2.05
NOLTLSIG Number of signalized intersections with a left-turn lane on the mainline 20 1.00 16.00 6.75 4.35
NOMEDOP Number of median openings 20 0.00 12.00 2.85 3.48
NOMEDOPLT Number of median openings with a left-turn lane 20 0.00 12.00 2.75 3.39
NOMEDOPNOLT Number of median openings without a left-turn lane 20 0.00 1.00 0.10 0.31
SPEED_LIMIT Posted speed limit (miles per hour) 20 30.00 55.00 40.00 7.05
AVGAADT Average AADT 20 10,018.00 86,773.00 33,724.00 17,160.00
SPCOFFLT Minimum spacing from off-ramp to available left turn onto mainline from same side of road (feet) 7 45.00 2,214.00 524.00 758.00
SPCOFFRT Minimum spacing from off-ramp to available right turn onto mainline from same side of road (feet) 7 46.00 726.00 181.00 244.00
SPCON Minimum spacing from on-ramp to available right turn onto mainline from same side of road (feet) 6 29.00 1,276.00 357.00 468.00
St. Dev. = standard deviation; TWLTL = two-way left-turn lane.

 

Table 78. Summary statistics for Southern California mixed-use land use.

Variable Name Variable Description Corridors Minimum Maximum Mean St. Dev.
Total Total crashes/mile-year 14 1.14 61.13 23.04 20.79
Injury Injury crashes/mile-year 14 1.14 24.87 10.51 7.34
Turning Turning crashes/mile-year 14 0.86 19.33 7.49 6.53
Rear-end Rear-end crashes/mile-year 14 0.00 30.07 8.37 8.89
Right-angle Right-angle crashes/mile-year 14 0.00 12.44 2.73 3.347
PROPLANE1 Proportion of total length with two lanes 14 0.00 0.00 0.00 0.00
PROPLANE2 Proportion of total length with three or four lanes 14 0.00 1.00 0.46 0.46
PROPLANE3 Proportion of total length with five or more lanes 14 0.00 1.00 0.54 0.46
PROPDIV Proportion of total length with curb or raised concrete median 14 0.00 1.00 0.48 0.43
PROPTWLTL Proportion of total length with a TWLTL 14 0.00 0.86 0.16 0.26
PROPUNDIV Proportion of total length with an undivided median 14 0.00 1.00 0.36 0.42
PROPNODEV Proportion of total length with no adjacent development 14 0.00 0.30 0.02 0.08
PROPPARTDEV Proportion of total length with partial adjacent development 14 0.00 1.00 0.34 0.42
PROPFULLDEV Proportion of total length with full adjacent development 14 0.00 1.00 0.64 0.41
PROPLIGHT Proportion of total length with illumination present 14 0.87 1.00 0.99 0.04
PROPPOORPVMNT Proportion of total length with a poor pavement condition 14 0.00 0.00 0.00 0.00
PROPVC Proportion of total length with visual clutter 14 0.00 1.00 0.81 0.29
PROPLIMCONN Proportion of total length with limited connectivity on adjacent developments 14 0.00 1.00 0.74 0.36
PROPMODCONN Proportion of total length with moderate connectivity on adjacent developments 14 0.00 1.00 0.24 0.36
PROPSIGCONN Proportion of total length with significant connectivity on adjacent developments 14 0.00 0.28 0.03 0.08
PROPFRONTRD Proportion of total length with a frontage road 14 0.00 1.00 0.27 0.33
DRWYDENS Number of driveways per mile 14 20.10 81.55 44.75 17.37
UNSIGDENS Number of unsignalized intersections per mile 14 0.57 15.36 7.06 4.04
ACCDENS Number of driveways plus unsignalized intersections per mile 14 20.68 87.55 51.81 19.76
SIGDENS Number of signalized intersections per mile 14 2.58 8.84 5.11 1.87
MEDOPDENS Number of median openings per mile 10 0.00 5.01 1.82 1.92
NODRWYS Number of driveways 14 16.00 684.00 181.57 220.54
NOCOMFULLDRWY Number of commercial full-movement driveways 14 0.00 448.00 78.07 119.43
NORESFULLDRWY Number of residential full-movement driveways 14 0.00 128.00 20.71 36.96
NOCOMLIMDRWY Number of commercial limited-movement driveways 14 0.00 614.00 76.21 161.99
NORESLIMDRWY Number of residential limited-movement driveways 14 0.00 32.00 6.57 10.50
NOUNSIG Number of unsignalized intersections 14 1.00 141.00 33.36 43.28
NO3LEGUNSIG Number of 3-legged unsignalized intersections 14 0.00 102.00 22.50 30.35
NO4LEGUNSIG Number of 4-legged unsignalized intersections 14 0.00 39.00 10.86 13.84
NO5LEGUNSIG Number of 5-legged unsignalized intersections 14 0.00 0.00 0.00 0.00
NO3LEGFULLUNSIG Number of 3-legged full-movement unsignalized intersections 14 0.00 56.00 13.86 16.59
NO3LEGLIMUNSIG Number of 3-legged limited-movement unsignalized intersections 14 0.00 86.00 8.64 22.84
NO3LEGRIROUNSIG Number of 3-legged right-in/right-out unsignalized intersections 14 0.00 82.00 8.29 21.82
NO3LEGLFMOUNSIG Number of 3-legged left from major only unsignalized intersections 14 0.00 4.00 0.36 1.08
NO4LEGFULLUNSIG Number of 4-legged full-movement unsignalized intersections 14 0.00 38.00 10.71 13.60
NO4LEGLIMUNSIG Number of 4-legged limited-movement unsignalized intersections 14 0.00 1.00 0.14 0.36
NO4LEGRIROUNSIG Number of 4-legged right-in/right-out unsignalized intersections 14 0.00 0.00 0.00 0.00
NO4LEGLFMOUNSIG Number of 4-legged left from major only unsignalized intersections 14 0.00 1.00 0.14 0.36
NORTLUNSIG Number of unsignalized intersections with a right-turn lane 14 0.00 0.00 0.00 0.00
NOLTLUNSIG Number of unsignalized intersections with a left-turn lane 14 0.00 84.00 19.21 25.32
NOSIG Number of signalized intersections 14 3.00 66.00 18.79 21.24
MINSPCSIG Minimum spacing of signalized intersections (feet) 14 139.00 1,461.00 495.00 388.00
MAXSPCSIG Maximum spacing of signalized intersections (feet) 14 846.00 4,130.00 1,992.00 1,023.00
NO3LEGSIG Number of 3-legged signalized intersections 14 0.00 11.00 2.57 2.98
NO4LEGSIG Number of 4-legged signalized intersections 14 2.00 57.00 16.07 18.52
NO5LEGSIG Number of 5-legged signalized intersections 14 0.00 1.00 0.07 0.27
NORTLSIG Number of signalized intersections with a right-turn lane on the mainline 14 0.00 25.00 4.29 6.57
NOLTLSIG Number of signalized intersections with a left-turn lane on the mainline 14 0.00 63.00 17.79 20.48
NOMEDOP Number of median openings 10 0.00 40.00 8.70 14.45
NOMEDOPLT Number of median openings with a left-turn lane 10 0.00 40.00 8.30 14.63
NOMEDOPNOLT Number of median openings without a left-turn lane 10 0.00 2.00 0.40 0.84
SPEED_LIMIT Posted speed limit (miles per hour) 14 25.00 45.00 38.00 4.70
AVGAADT Average AADT 14 17,723.00 67,080.00 45,707.00 15,177.00
SPCOFFLT Minimum spacing from off-ramp to available left turn onto mainline from same side of road (feet) 3 275.00 360.00 325.00 44.00
SPCOFFRT Minimum spacing from off-ramp to available right turn onto mainline from same side of road (feet) 3 275.00 360.00 325.00 44.00
SPCON Minimum spacing from on-ramp to available right turn onto mainline from same side of road (feet) 2 235.00 255.00 245.00 14.00
St. Dev. = standard deviation; TWLTL = two-way left-turn lane.

 

COMMERCIAL

Table 79. Summary statistics for North Carolina commercial land use.

Variable Name Variable Description Corridors Minimum Maximum Mean St. Dev.
Total Total crashes/mile-year 24 0.84 195.31 39.21 38.46
Injury Injury crashes/mile-year 24 0.00 40.74 8.92 8.03
Turning Turning crashes/mile-year 24 0.00 24.44 6.27 5.86
Rear-end Rear-end crashes/mile-year 24 0.00 69.63 17.18 16.46
Right-angle Right-angle crashes/mile-year 24 0.00 52.10 6.73 10.30
PROPLANE1 Proportion of total length with two lanes 24 0.00 1.00 0.21 0.39
PROPLANE2 Proportion of total length with three or four lanes 24 0.00 1.00 0.63 0.42
PROPLANE3 Proportion of total length with five or more lanes 24 0.00 1.00 0.18 0.32
PROPDIV Proportion of total length with curb or raised concrete median 24 0.00 1.00 0.51 0.46
PROPTWLTL Proportion of total length with a TWLTL 24 0.00 1.00 0.29 0.37
PROPUNDIV Proportion of total length with an undivided median 24 0.00 1.00 0.21 0.35
PROPNODEV Proportion of total length with no adjacent development 24 0.00 1.00 0.15 0.32
PROPPARTDEV Proportion of total length with partial adjacent development 24 0.00 1.00 0.74 0.38
PROPFULLDEV Proportion of total length with full adjacent development 24 0.00 1.00 0.11 0.28
PROPLIGHT Proportion of total length with illumination present 24 0.00 1.00 0.66 0.45
PROPPOORPVMNT Proportion of total length with a poor pavement condition 23 0.00 0.71 0.05 0.15
PROPVC Proportion of total length with visual clutter 24 0.00 1.00 0.16 0.34
PROPLIMCONN Proportion of total length with limited connectivity on adjacent developments 24 0.00 1.00 0.22 0.38
PROPMODCONN Proportion of total length with moderate connectivity on adjacent developments 24 0.00 0.74 0.12 0.21
PROPSIGCONN Proportion of total length with significant connectivity on adjacent developments 24 0.00 1.00 0.62 0.41
PROPFRONTRD Proportion of total length with a frontage road 24 0.00 0.42 0.03 0.10
DRWYDENS Number of driveways per mile 24 0.00 50.00 10.79 11.90
UNSIGDENS Number of unsignalized intersections per mile 24 0.00 8.00 4.05 2.19
ACCDENS Number of driveways plus unsignalized intersections per mile 24 0.92 57.78 14.85 12.63
SIGDENS Number of signalized intersections per mile 24 0.00 9.04 2.96 2.00
MEDOPDENS Number of median openings per mile 18 0.00 5.62 0.96 1.45
NODRWYS Number of driveways 24 0.00 103.00 20.96 25.33
NOCOMFULLDRWY Number of commercial full-movement driveways 24 0.00 78.00 9.88 17.85
NORESFULLDRWY Number of residential full-movement driveways 24 0.00 22.00 2.63 6.41
NOCOMLIMDRWY Number of commercial limited-movement driveways 24 0.00 39.00 8.00 10.17
NORESLIMDRWY Number of residential limited-movement driveways 24 0.00 5.00 0.46 1.32
NOUNSIG Number of unsignalized intersections 24 0.00 34.00 7.54 7.40
NO3LEGUNSIG Number of 3-legged unsignalized intersections 24 0.00 19.00 5.63 5.19
NO4LEGUNSIG Number of 4-legged unsignalized intersections 24 0.00 15.00 1.92 3.09
NO5LEGUNSIG Number of 5-legged unsignalized intersections 24 0.00 0.00 0.00 0.00
NO3LEGFULLUNSIG Number of 3-legged full-movement unsignalized intersections 24 0.00 18.00 3.21 3.92
NO3LEGLIMUNSIG Number of 3-legged limited-movement unsignalized intersections 24 0.00 13.00 2.42 3.09
NO3LEGRIROUNSIG Number of 3-legged right-in/right-out unsignalized intersections 24 0.00 10.00 2.04 2.56
NO3LEGLFMOUNSIG Number of 3-legged unsignalized intersections with no left-turn movement from crossroad 24 0.00 3.00 0.38 0.77
NO4LEGFULLUNSIG Number of 4-legged full-movement unsignalized intersections 24 0.00 15.00 1.71 3.09
NO4LEGLIMUNSIG Number of 4-legged limited-movement unsignalized intersections 24 0.00 2.00 0.21 0.51
NO4LEGRIROUNSIG Number of 4-legged right-in/right-out unsignalized intersections 24 0.00 1.00 0.08 0.28
NO4LEGLFMOUNSIG Number of 4-legged unsignalized intersections with no left-turn movement from crossroad 24 0.00 2.00 0.13 0.45
NORTLUNSIG Number of unsignalized intersections with a right-turn lane 24 0.00 14.00 2.08 3.23
NOLTLUNSIG Number of unsignalized intersections with a left-turn lane 24 0.00 31.00 4.79 6.59
NOSIG Number of signalized intersections 24 0.00 15.00 4.88 3.71
MINSPCSIG Minimum spacing of signalized intersections (feet) 21 201.00 12,228.00 1,691.00 2,551.00
MAXSPCSIG Maximum spacing of signalized intersections (feet) 21 977.00 12,228.00 3,934.00 2,936.00
NO3LEGSIG Number of 3-legged signalized intersections 24 0.00 4.00 0.96 1.16
NO4LEGSIG Number of 4-legged signalized intersections 24 0.00 11.00 3.88 2.86
NO5LEGSIG Number of 5-legged signalized intersections 24 0.00 0.00 0.00 0.00
NORTLSIG Number of signalized intersections with a right-turn lane on the mainline 24 0.00 9.00 3.42 2.32
NOLTLSIG Number of signalized intersections with a left-turn lane on the mainline 24 0.00 15.00 4.75 3.65
NOMEDOP Number of median openings 18 0.00 10.00 2.22 3.34
MEDOPLT Number of median openings with a left-turn lane 18 0.00 10.00 1.89 3.12
MEDOPNOLT Number of median openings without a left-turn lane 18 0.00 6.00 0.33 1.41
SPEED_LIMIT Posted speed limit (miles per hour) 24 35.00 55.00 45.00 4.29
AVGAADT Average AADT 24 50.00 46,087.00 22,085.00 13,311.00
SPCOFFLT Minimum spacing from off-ramp to available left turn onto mainline from same side of road (feet) 12 376.00 1,991.00 856.00 458.00
SPCOFFRT Minimum spacing from off-ramp to available right turn onto mainline from same side of road (feet) 12 331.00 1,991.00 808.00 490.00
SPCON Minimum spacing from on-ramp to available right turn onto mainline from same side of road (feet) 12 189.00 2,446.00 1,063.00 700.00
St. Dev. = standard deviation; TWLTL = two-way left-turn lane.

 

Table 80. Summary statistics for Minnesota commercial land use.

Variable Name Variable Description Corridors Minimum Maximum Mean St. Dev.
Total Total crashes/mile-year 20 12.62 140.26 38.85 30.27
Injury Injury crashes/mile-year 20 12.62 140.26 38.85 30.27
Turning Turning crashes/mile-year 20 0.22 23.93 3.12 5.12
Rear-end Rear-end crashes/mile-year 20 5.56 65.28 20.01 15.85
Right-angle Right-angle crashes/mile-year 20 1.35 27.64 6.29 7.10
PROPLANE1 Proportion of total length with two lanes 20 0.00 1.00 0.12 0.32
PROPLANE2 Proportion of total length with three or four lanes 20 0.00 1.00 0.83 0.32
PROPLANE3 Proportion of total length with five or more lanes 20 0.00 0.37 0.04 0.11
PROPDIV Proportion of total length with curb or raised concrete median 20 0.00 1.00 0.73 0.41
PROPTWLTL Proportion of total length with a TWLTL 20 0.00 1.00 0.10 0.29
PROPUNDIV Proportion of total length with an undivided median 20 0.00 1.00 0.17 0.33
PROPNODEV Proportion of total length with no adjacent development 20 0.00 0.14 0.01 0.03
PROPPARTDEV Proportion of total length with partial adjacent development 20 0.50 1.00 0.92 0.16
PROPFULLDEV Proportion of total length with full adjacent development 20 0.00 0.50 0.07 0.16
PROPLIGHT Proportion of total length with illumination present 20 0.00 1.00 0.51 0.47
PROPPOORPVMNT Proportion of total length with a poor pavement condition 20 0.00 1.00 0.10 0.27
PROPVC Proportion of total length with visual clutter 20 0.00 1.00 0.37 0.41
PROPLIMCONN Proportion of total length with limited connectivity on adjacent developments 20 0.00 1.00 0.44 0.39
PROPMODCONN Proportion of total length with moderate connectivity on adjacent developments 20 0.00 1.00 0.50 0.39
PROPSIGCONN Proportion of total length with significant connectivity on adjacent developments 20 0.00 1.00 0.07 0.23
PROPFRONTRD Proportion of total length with a frontage road 20 0.00 1.00 0.67 0.40
DRWYDENS Number of driveways per mile 20 0.00 39.56 10.96 13.27
UNSIGDENS Number of unsignalized intersections per mile 20 0.00 7.46 2.61 2.22
ACCDENS Number of driveways plus unsignalized intersections per mile 20 0.00 46.44 13.57 15.23
SIGDENS Number of signalized intersections per mile 20 0.57 7.21 3.11 1.88
MEDOPDENS Number of median openings per mile 17 0.00 6.31 0.99 1.52
NODRWYS Number of driveways 20 0.00 91.00 25.15 30.36
NOCOMFULLDRWY Number of commercial full-movement driveways 20 0.00 89.00 9.85 20.73
NORESFULLDRWY Number of residential full-movement driveways 20 0.00 6.00 1.00 1.97
NOCOMLIMDRWY Number of commercial limited-movement driveways 20 0.00 62.00 12.55 20.92
NORESLIMDRWY Number of residential limited-movement driveways 20 0.00 15.00 1.75 4.14
NOUNSIG Number of unsignalized intersections 20 0.00 24.00 7.05 6.59
NO3LEGUNSIG Number of 3-legged unsignalized intersections 20 0.00 21.00 4.65 5.15
NO4LEGUNSIG Number of 4-legged unsignalized intersections 20 0.00 12.00 2.35 3.31
NO5LEGUNSIG Number of 5-legged unsignalized intersections 20 0.00 1.00 0.05 0.22
NO3LEGFULLUNSIG Number of 3-legged full-movement unsignalized intersections 20 0.00 14.00 2.25 3.18
NO3LEGLIMUNSIG Number of 3-legged limited-movement unsignalized intersections 20 0.00 11.00 2.45 3.43
NO3LEGRIROUNSIG Number of 3-legged right-in/right-out unsignalized intersections 20 0.00 11.00 2.40 3.45
NO3LEGLFMOUNSIG Number of 3-legged unsignalized intersections with no left-turn movement from crossroad 20 0.00 1.00 0.05 0.22
NO4LEGFULLUNSIG Number of 4-legged full-movement unsignalized intersections 20 0.00 13.00 2.35 3.39
NO4LEGLIMUNSIG Number of 4-legged limited-movement unsignalized intersections 20 0.00 1.00 0.05 0.22
NO4LEGRIROUNSIG Number of 4-legged right-in/right-out unsignalized intersections 20 0.00 0.00 0.00 0.00
NO4LEGLFMOUNSIG Number of 4-legged left from major only unsignalized intersections 20 0.00 0.00 0.00 0.00
NORTLUNSIG Number of unsignalized intersections with a right-turn lane 20 0.00 13.00 3.00 3.67
NOLTLUNSIG Number of unsignalized intersections with a left-turn lane 20 0.00 14.00 3.70 4.78
NOSIG Number of signalized intersections 20 2.00 16.00 7.10 3.70
MINSPCSIG Minimum spacing of signalized intersections (feet) 20 141.00 3,612.00 1,275.00 1,030.00
MAXSPCSIG Maximum spacing of signalized intersections (feet) 20 143.00 27,595.00 4,535.00 5,702.00
NO3LEGSIG Number of 3-legged signalized intersections 20 0.00 3.00 0.65 0.93
NO4LEGSIG Number of 4-legged signalized intersections 20 2.00 13.00 6.45 3.28
NO5LEGSIG Number of 5-legged signalized intersections 20 0.00 0.00 0.00 0.00
NORTLSIG Number of signalized intersections with a right-turn lane on the mainline 20 1.00 11.00 4.75 2.65
NOLTLSIG Number of signalized intersections with a left-turn lane on the mainline 20 2.00 11.00 6.25 2.77
NOMEDOP Number of median openings 17 0.00 22.00 3.29 5.62
NOMEDOPLT Number of median openings with a left-turn lane 17 0.00 17.00 3.06 5.10
NOMEDOPNOLT Number of median openings without a left-turn lane 17 0.00 5.00 0.65 1.50
SPEED_LIMIT Posted speed limit (miles per hour) 20 30.00 60.00 45.00 10.94
AVGAADT Average AADT 20 14,295.00 52,858.00 30,402.00 12,016.00
SPCOFFLT Minimum spacing from off-ramp to available left turn onto mainline from same side of road (feet) 9 142.00 1,554.00 808.00 499.00
SPCOFFRT Minimum spacing from off-ramp to available right turn onto mainline from same side of road (feet) 9 142.00 1,554.00 749.00 454.00
SPCON Minimum spacing from on-ramp to available right turn onto mainline from same side of road (feet) 9 93.00 3,500.00 1,053.00 1,011.00
St. Dev. = standard deviation; TWLTL = two-way left-turn lane.

 

Table 81. Summary statistics for Northern California commercial land use.

Variable Name Variable Description Corridors Minimum Maximum Mean St. Dev.
Total Total crashes/mile-year 22 0.54 43.84 21.17 14.41
Injury Injury crashes/mile-year 22 0.32 17.81 7.90 5.30
Turning Turning crashes/mile-year 22 0.00 12.72 5.34 3.77
Rear-end Rear-end crashes/mile-year 22 0.00 25.57 9.95 7.92
Right-angle Right-angle crashes/mile-year 22 0.00 7.02 2.01 1.70
PROPLANE1 Proportion of total length with two lanes 22 0.00 1.00 0.16 0.35
PROPLANE2 Proportion of total length with three or four lanes 22 0.00 1.00 0.49 0.44
PROPLANE3 Proportion of total length with five or more lanes 22 0.00 1.00 0.35 0.43
PROPDIV Proportion of total length with curb or raised concrete median 22 0.00 1.00 0.64 0.45
PROPTWLTL Proportion of total length with a TWLTL 22 0.00 1.00 0.23 0.35
PROPUNDIV Proportion of total length with an undivided median 22 0.00 1.00 0.14 0.28
PROPNODEV Proportion of total length with no adjacent development 22 0.00 1.00 0.06 0.23
PROPPARTDEV Proportion of total length with partial adjacent development 22 0.00 1.00 0.43 0.45
PROPFULLDEV Proportion of total length with full adjacent development 22 0.00 1.00 0.51 0.47
PROPLIGHT Proportion of total length with illumination present 22 0.00 1.00 0.90 0.24
PROPPOORPVMNT Proportion of total length with a poor pavement condition 22 0.00 0.10 0.00 0.02
PROPVC Proportion of total length with visual clutter 22 0.00 1.00 0.29 0.41
PROPLIMCONN Proportion of total length with limited connectivity on adjacent developments 22 0.00 1.00 0.29 0.37
PROPMODCONN Proportion of total length with moderate connectivity on adjacent developments 22 0.00 1.00 0.40 0.38
PROPSIGCONN Proportion of total length with significant connectivity on adjacent developments 22 0.00 1.00 0.31 0.41
PROPFRONTRD Proportion of total length with a frontage road 22 0.00 1.00 0.18 0.30
DRWYDENS Number of driveways per mile 22 2.00 67.88 38.82 18.61
UNSIGDENS Number of unsignalized intersections per mile 22 1.50 13.09 6.41 3.88
ACCDENS Number of driveways plus unsignalized intersections per mile 22 3.50 72.97 45.23 20.22
SIGDENS Number of signalized intersections per mile 22 0.00 8.06 4.17 1.96
MEDOPDENS Number of median openings per mile 21 0.00 6.08 1.88 1.85
NODRWYS Number of driveways 22 4.00 627.00 137.14 177.62
NOCOMFULLDRWY Number of commercial full-movement driveways 22 0.00 415.00 43.05 89.66
NORESFULLDRWY Number of residential full-movement driveways 22 0.00 49.00 2.68 10.40
NOCOMLIMDRWY Number of commercial limited-movement driveways 22 0.00 477.00 87.73 125.51
NORESLIMDRWY Number of residential limited-movement driveways 22 0.00 22.00 3.68 6.31
NOUNSIG Number of unsignalized intersections 22 2.00 137.00 22.45 33.50
NO3LEGUNSIG Number of 3-legged unsignalized intersections 22 2.00 92.00 18.36 25.27
NO4LEGUNSIG Number of 4-legged unsignalized intersections 22 0.00 45.00 4.09 9.70
NO5LEGUNSIG Number of 5-legged unsignalized intersections 22 0.00 0.00 0.00 0.00
NO3LEGFULLUNSIG Number of 3-legged full-movement unsignalized intersections 22 0.00 68.00 9.68 15.93
NO3LEGLIMUNSIG Number of 3-legged limited-movement unsignalized intersections 22 0.00 36.00 9.14 12.38
NO3LEGRIROUNSIG Number of 3-legged right-in/right-out unsignalized intersections 22 0.00 36.00 8.68 11.75
NO3LEGLFMOUNSIG Number of 3-legged unsignalized intersections with no left-turn movement from crossroad 22 0.00 3.00 0.45 0.91
NO4LEGFULLUNSIG Number of 4-legged full-movement unsignalized intersections 22 0.00 45.00 4.00 9.72
NO4LEGLIMUNSIG Number of 4-legged limited-movement unsignalized intersections 22 0.00 2.00 0.09 0.43
NO4LEGRIROUNSIG Number of 4-legged right-in/right-out unsignalized intersections 22 0.00 1.00 0.05 0.21
NO4LEGLFMOUNSIG Number of 4-legged unsignalized intersections with no left-turn movement from crossroad 22 0.00 1.00 0.05 0.21
NORTLUNSIG Number of unsignalized intersections with a right-turn lane 22 0.00 5.00 0.50 1.34
NOLTLUNSIG Number of unsignalized intersections with a left-turn lane 22 0.00 89.00 11.59 19.92
NOSIG Number of signalized intersections 22 0.00 54.00 12.95 14.86
MINSPCSIG Minimum spacing of signalized intersections (feet) 19 114.00 3,408.00 650.00 721.00
MAXSPCSIG Maximum spacing of signalized intersections (feet) 19 735.00 5,745.00 2,133.00 1,199.00
NO3LEGSIG Number of 3-legged signalized intersections 22 0.00 14.00 3.27 3.95
NO4LEGSIG Number of 4-legged signalized intersections 22 0.00 41.00 9.50 11.45
NO5LEGSIG Number of 5-legged signalized intersections 22 0.00 5.00 0.36 1.14
NORTLSIG Number of signalized intersections with a right-turn lane on the mainline 22 0.00 9.00 2.91 2.51
NOLTLSIG Number of signalized intersections with a left-turn lane on the mainline 22 0.00 42.00 12.09 13.31
NOMEDOP Number of median openings 21 0.00 42.00 7.29 11.38
NOMEDOPLT Number of median openings with a left-turn lane 21 0.00 34.00 6.24 9.88
NOMEDOPNOLT Number of median openings without a left-turn lane 21 0.00 8.00 1.10 2.47
SPEED_LIMIT Posted speed limit (miles per hour) 22 30.00 50.00 38.00 5.29
AVGAADT Average AADT 22 6,233.00 46,014.00 27,364.00 10,725.00
SPCOFFLT Minimum spacing from off-ramp to available left turn onto mainline from same side of road (feet) 4 200.00 1,483.00 783.00 590.00
SPCOFFRT Minimum spacing from off-ramp to available right turn onto mainline from same side of road (feet) 4 21.00 1,048.00 311.00 494.00
SPCON Minimum spacing from on-ramp to available right turn onto mainline from same side of road (feet) 4 32.00 215.00 101.00 79.00
St. Dev. = standard deviation; TWLTL = two-way left-turn lane.

 

Table 82. Summary statistics for Southern California commercial land use.

Variable Name Variable Description Corridors Minimum Maximum Mean St. Dev.
Total Total crashes/mile-year 22 1.64 108.99 26.65 22.41
Injury Injury crashes/mile-year 22 0.33 35.88 8.26 7.65
Turning Turning crashes/mile-year 22 0.33 35.88 8.26 7.65
Rear-end Rear-end crashes/mile-year 22 0.33 43.60 11.13 9.80
Right-angle Right-angle crashes/mile-year 22 0.00 14.99 2.72 3.08
PROPLANE1 Proportion of total length with two lanes 22 0.00 0.47 0.02 0.10
PROPLANE2 Proportion of total length with three or four lanes 22 0.00 1.00 0.56 0.45
PROPLANE3 Proportion of total length with five or more lanes 22 0.00 1.00 0.42 0.46
PROPDIV Proportion of total length with curb or raised concrete median 22 0.00 1.00 0.44 0.44
PROPTWLTL Proportion of total length with a TWLTL 22 0.00 1.00 0.41 0.42
PROPUNDIV Proportion of total length with an undivided median 22 0.00 1.00 0.15 0.30
PROPNODEV Proportion of total length with no adjacent development 22 0.00 1.00 0.13 0.30
PROPPARTDEV Proportion of total length with partial adjacent development 22 0.00 1.00 0.55 0.44
PROPFULLDEV Proportion of total length with full adjacent development 22 0.00 1.00 0.33 0.41
PROPLIGHT Proportion of total length with illumination present 22 0.00 1.00 0.78 0.39
PROPPOORPVMNT Proportion of total length with a poor pavement condition 22 0.00 0.00 0.00 0.00
PROPVC Proportion of total length with visual clutter 22 0.00 1.00 0.30 0.39
PROPLIMCONN Proportion of total length with limited connectivity on adjacent developments 22 0.00 1.00 0.41 0.37
PROPMODCONN Proportion of total length with moderate connectivity on adjacent developments 22 0.00 1.00 0.50 0.36
PROPSIGCONN Proportion of total length with significant connectivity on adjacent developments 22 0.00 1.00 0.09 0.23
PROPFRONTRD Proportion of total length with a frontage road 22 0.00 1.00 0.36 0.41
DRWYDENS Number of driveways per mile 22 0.00 63.69 26.81 19.51
UNSIGDENS Number of unsignalized intersections per mile 22 0.00 16.07 5.69 3.70
ACCDENS Number of driveways plus unsignalized intersections per mile 22 1.97 79.76 32.50 22.07
SIGDENS Number of signalized intersections per mile 22 0.00 5.45 3.31 1.30
MEDOPDENS Number of median openings per mile 15 0.00 12.01 2.06 3.10
NODRWYS Number of driveways 22 0.00 279.00 73.50 79.34
NOCOMFULLDRWY Number of commercial full-movement driveways 22 0.00 216.00 38.23 60.13
NORESFULLDRWY Number of residential full-movement driveways 22 0.00 58.00 5.73 15.04
NOCOMLIMDRWY Number of commercial limited-movement driveways 22 0.00 152.00 29.45 46.53
NORESLIMDRWY Number of residential limited-movement driveways 22 0.00 2.00 0.09 0.43
NOUNSIG Number of unsignalized intersections 22 0.00 58.00 15.55 17.68
NO3LEGUNSIG Number of 3-legged unsignalized intersections 22 0.00 53.00 12.00 14.82
NO4LEGUNSIG Number of 4-legged unsignalized intersections 22 0.00 21.00 3.55 5.23
NO5LEGUNSIG Number of 5-legged unsignalized intersections 22 0.00 0.00 0.00 0.00
NO3LEGFULLUNSIG Number of 3-legged full-movement unsignalized intersections 22 0.00 35.00 6.14 9.75
NO3LEGLIMUNSIG Number of 3-legged limited-movement unsignalized intersections 22 0.00 37.00 5.41 9.96
NO3LEGRIROUNSIG Number of 3-legged right-in/right-out unsignalized intersections 22 0.00 29.00 4.73 8.40
NO3LEGLFMOUNSIG Number of 3-legged left from major only unsignalized intersections 22 0.00 6.00 0.59 1.50
NO4LEGFULLUNSIG Number of 4-legged full-movement unsignalized intersections 22 0.00 21.00 3.55 5.23
NO4LEGLIMUNSIG Number of 4-legged limited-movement unsignalized intersections 22 0.00 0.00 0.00 0.00
NO4LEGRIROUNSIG Number of 4-legged right-in/right-out unsignalized intersections 22 0.00 0.00 0.00 0.00
NO4LEGLFMOUNSIG Number of 4-legged left from major only unsignalized intersections 22 0.00 0.00 0.00 0.00
NORTLUNSIG Number of unsignalized intersections with a right-turn lane 22 0.00 8.00 0.73 2.07
NOLTLUNSIG Number of unsignalized intersections with a left-turn lane 22 0.00 40.00 8.64 11.20
NOSIG Number of signalized intersections 22 0.00 38.00 8.95 9.72
MINSPCSIG Minimum spacing of signalized intersections (feet) 21 344.00 2,882.00 1,175.00 833.00
MAXSPCSIG Maximum spacing of signalized intersections (feet) 21 583.00 7,520.00 2,806.00 1,554.00
NO3LEGSIG Number of 3-legged signalized intersections 22 0.00 6.00 0.91 1.44
NO4LEGSIG Number of 4-legged signalized intersections 22 0.00 35.00 8.05 9.13
NO5LEGSIG Number of 5-legged signalized intersections 22 0.00 0.00 0.00 0.00
NORTLSIG Number of signalized intersections with a right-turn lane on the mainline 22 0.00 16.00 2.73 4.24
NOLTLSIG Number of signalized intersections with a left-turn lane on the mainline 22 0.00 37.00 8.68 9.57
NOMEDOP Number of median openings 15 0.00 31.00 6.20 8.68
NOMEDOPLT Number of median openings with a left-turn lane 15 0.00 25.00 5.13 7.44
NOMEDOPNOLT Number of median openings without a left-turn lane 15 0.00 6.00 1.07 1.94
SPEED_LIMIT Posted speed limit (miles per hour) 22 35.00 50.00 42.00 4.51
AVGAADT Average AADT 22 11,538.00 66,002.00 34,380.00 14,088.00
SPCOFFLT Minimum spacing from off-ramp to available left turn onto mainline from same side of road (feet) 3 129.00 550.00 348.00 211.00
SPCOFFRT Minimum spacing from off-ramp to available right turn onto mainline from same side of road (feet) 3 20.00 134.00 83.00 58.00
SPCON Minimum spacing from on-ramp to available right turn onto mainline from same side of road (feet) 2 33.00 109.00 71.00 54.00
St. Dev. = standard deviation; TWLTL = two-way left-turn lane.

 

RESIDENTIAL

Table 83. Summary statistics for North Carolina residential land use.

Variable Name Variable Description Corridors Minimum Maximum Mean St. Dev.
Total Total crashes/mile-year 24 5.22 39.65 18.04 10.01
Injury Injury crashes/mile-year 24 1.12 11.58 4.91 2.51
Turning Turning crashes/mile-year 24 0.00 18.27 3.31 3.57
Rear-end Rear-end crashes/mile-year 24 0.97 18.97 8.21 5.63
Right-angle Right-angle crashes/mile-year 24 0.00 7.30 2.75 2.05
PROPLANE1 Proportion of total length with two lanes 24 0.00 1.00 0.11 0.30
PROPLANE2 Proportion of total length with three or four lanes 24 0.00 1.00 0.89 0.30
PROPLANE3 Proportion of total length with five or more lanes 24 0.00 0.00 0.00 0.00
PROPDIV Proportion of total length with curb or raised concrete median 24 0.00 1.00 0.32 0.43
PROPTWLTL Proportion of total length with a TWLTL 24 0.00 1.00 0.36 0.42
PROPUNDIV Proportion of total length with an undivided median 24 0.00 1.00 0.30 0.43
PROPNODEV Proportion of total length with no adjacent development 24 0.00 1.00 0.09 0.28
PROPPARTDEV Proportion of total length with partial adjacent development 24 0.00 1.00 0.91 0.28
PROPFULLDEV Proportion of total length with full adjacent development 24 0.00 0.00 0.00 0.00
PROPLIGHT Proportion of total length with illumination present 24 0.00 1.00 0.79 0.41
PROPPOORPVMNT Proportion of total length with a poor pavement condition 24 0.00 1.00 0.08 0.24
PROPVC Proportion of total length with visual clutter 24 0.00 0.00 0.00 0.00
PROPLIMCONN Proportion of total length with limited connectivity on adjacent developments 24 0.00 1.00 0.36 0.40
PROPMODCONN Proportion of total length with moderate connectivity on adjacent developments 24 0.00 1.00 0.19 0.31
PROPSIGCONN Proportion of total length with significant connectivity on adjacent developments 24 0.00 1.00 0.46 0.45
PROPFRONTRD Proportion of total length with a frontage road 24 0.00 0.00 0.00 0.00
DRWYDENS Number of driveways per mile 24 0.00 53.55 17.59 16.82
UNSIGDENS Number of unsignalized intersections per mile 24 0.73 12.05 6.94 2.42
ACCDENS Number of driveways plus unsignalized intersections per mile 24 1.46 65.60 24.53 18.13
SIGDENS Number of signalized intersections per mile 24 0.51 3.75 1.67 0.83
MEDOPDENS Number of median openings per mile 15 0.00 5.24 1.02 1.59
NODRWYS Number of driveways 24 0.00 70.00 25.17 21.10
NOCOMFULLDRWY Number of commercial full-movement driveways 24 0.00 20.00 3.38 4.80
NORESFULLDRWY Number of residential full-movement driveways 24 0.00 60.00 18.25 19.69
NOCOMLIMDRWY Number of commercial limited-movement driveways 24 0.00 18.00 1.88 4.19
NORESLIMDRWY Number of residential limited-movement driveways 24 0.00 18.00 1.67 3.85
NOUNSIG Number of unsignalized intersections 24 2.00 30.00 11.79 7.45
NO3LEGUNSIG Number of 3-legged unsignalized intersections 24 2.00 39.00 10.08 8.48
NO4LEGUNSIG Number of 4-legged unsignalized intersections 24 0.00 8.00 2.79 2.11
NO5LEGUNSIG Number of 5-legged unsignalized intersections 24 0.00 0.00 0.00 0.00
NO3LEGFULLUNSIG Number of 3-legged full-movement unsignalized intersections 24 1.00 23.00 7.29 5.52
NO3LEGLIMUNSIG Number of 3-legged limited-movement unsignalized intersections 24 0.00 11.00 1.71 2.54
NO3LEGRIROUNSIG Number of 3-legged right-in/right-out unsignalized intersections 24 0.00 11.00 1.67 2.57
NO3LEGLFMOUNSIG Number of 3-legged unsignalized intersections with no left-turn movement from crossroad 24 0.00 1.00 0.04 0.20
NO4LEGFULLUNSIG Number of 4-legged full-movement unsignalized intersections 24 0.00 8.00 2.63 2.10
NO4LEGLIMUNSIG Number of 4-legged limited-movement unsignalized intersections 24 0.00 1.00 0.17 0.38
NO4LEGRIROUNSIG Number of 4-legged right-in/right-out unsignalized intersections 24 0.00 1.00 0.17 0.38
NO4LEGLFMOUNSIG Number of 4-legged unsignalized intersections with no left-turn movement from crossroad 24 0.00 0.00 0.00 0.00
NORTLUNSIG Number of unsignalized intersections with a right-turn lane 24 0.00 7.00 1.42 1.77
NOLTLUNSIG Number of unsignalized intersections with a left-turn lane 24 0.00 30.00 7.67 7.51
NOSIG Number of signalized intersections 24 1.00 8.00 2.83 1.99
MINSPCSIG Minimum spacing of signalized intersections (feet) 18 646.00 6,506.00 2,446.00 1,538.00
MAXSPCSIG Maximum spacing of signalized intersections (feet) 18 1,628.00 11,378.00 4,462.00 2,287.00
NO3LEGSIG Number of 3-legged signalized intersections 24 0.00 2.00 0.58 0.72
NO4LEGSIG Number of 4-legged signalized intersections 24 0.00 6.00 2.29 1.76
NO5LEGSIG Number of 5-legged signalized intersections 24 0.00 0.00 0.00 0.00
NORTLSIG Number of signalized intersections with a right-turn lane on the mainline 24 0.00 8.00 1.67 1.71
NOLTLSIG Number of signalized intersections with a left-turn lane on the mainline 24 1.00 8.00 2.71 1.99
NOMEDOP Number of median openings 15 0.00 7.00 1.40 2.13
MEDOPLT Number of median openings with a left-turn lane 15 0.00 6.00 1.33 1.95
MEDOPNOLT Number of median openings without a left-turn lane 15 0.00 1.00 0.07 0.26
SPEED_LIMIT Posted speed limit (miles per hour) 24 35.00 55.00 44.00 5.10
AVGAADT Average AADT 24 90.00 31,353.00 14,695.00 7,128.00
St. Dev. = standard deviation; TWLTL = two-way left-turn lane.

 

Table 84. Summary statistics for Minnesota residential land use.

Variable Name Variable Description Corridors Minimum Maximum Mean St. Dev.
Total Total crashes/mile-year 21 3.10 79.08 23.35 21.46
Injury Injury crashes/mile-year 21 1.19 26.43 7.72 7.95
Turning Turning crashes/mile-year 21 0.00 5.79 1.52 1.76
Rear-end Rear-end crashes/mile-year 21 0.33 48.49 10.95 13.30
Right-angle Right-angle crashes/mile-year 21 0.36 24.59 4.04 5.44
PROPLANE1 Proportion of total length with two lanes 21 0.00 1.00 0.56 0.50
PROPLANE2 Proportion of total length with three or four lanes 21 0.00 1.00 0.39 0.49
PROPLANE3 Proportion of total length with five or more lanes 21 0.00 1.00 0.05 0.22
PROPDIV Proportion of total length with curb or raised concrete median 21 0.00 1.00 0.34 0.44
PROPTWLTL Proportion of total length with a TWLTL 21 0.00 0.29 0.02 0.06
PROPUNDIV Proportion of total length with an undivided median 21 0.00 1.00 0.64 0.43
PROPNODEV Proportion of total length with no adjacent development 21 0.00 0.40 0.05 0.12
PROPPARTDEV Proportion of total length with partial adjacent development 21 0.00 1.00 0.81 0.34
PROPFULLDEV Proportion of total length with full adjacent development 21 0.00 1.00 0.14 0.34
PROPLIGHT Proportion of total length with illumination present 21 0.00 1.00 0.37 0.44
PROPPOORPVMNT Proportion of total length with a poor pavement condition 21 0.00 0.00 0.00 0.00
PROPVC Proportion of total length with visual clutter 21 0.00 0.34 0.02 0.07
PROPLIMCONN Proportion of total length with limited connectivity on adjacent developments 21 0.00 1.00 0.93 0.23
PROPMODCONN Proportion of total length with moderate connectivity on adjacent developments 21 0.00 0.33 0.03 0.08
PROPSIGCONN Proportion of total length with significant connectivity on adjacent developments 21 0.00 1.00 0.05 0.22
PROPFRONTRD Proportion of total length with a frontage road 21 0.00 1.00 0.44 0.46
DRWYDENS Number of driveways per mile 21 0.00 73.86 20.93 20.91
UNSIGDENS Number of unsignalized intersections per mile 21 0.00 15.24 5.90 3.83
ACCDENS Number of driveways plus unsignalized intersections per mile 21 0.00 79.72 26.82 23.26
SIGDENS Number of signalized intersections per mile 21 0.21 5.49 1.93 1.32
MEDOPDENS Number of median openings per mile 16 0.00 3.25 0.52 0.98
NODRWYS Number of driveways 21 0.00 221.00 51.52 59.93
NOCOMFULLDRWY Number of commercial full-movement driveways 21 0.00 54.00 10.19 13.74
NORESFULLDRWY Number of residential full-movement driveways 21 0.00 160.00 39.86 46.37
NOCOMLIMDRWY Number of commercial limited-movement driveways 21 0.00 8.00 1.00 2.30
NORESLIMDRWY Number of residential limited-movement driveways 21 0.00 5.00 0.48 1.29
NOUNSIG Number of unsignalized intersections 21 0.00 51.00 15.43 15.95
NO3LEGUNSIG Number of 3-legged unsignalized intersections 21 0.00 38.00 9.33 11.94
NO4LEGUNSIG Number of 4-legged unsignalized intersections 21 0.00 19.00 6.05 6.25
NO5LEGUNSIG Number of 5-legged unsignalized intersections 21 0.00 1.00 0.05 0.22
NO3LEGFULLUNSIG Number of 3-legged full-movement unsignalized intersections 21 0.00 38.00 8.57 11.82
NO3LEGLIMUNSIG Number of 3-legged limited-movement unsignalized intersections 21 0.00 5.00 0.76 1.41
NO3LEGRIROUNSIG Number of 3-legged right-in/right-out unsignalized intersections 21 0.00 5.00 0.71 1.42
NO3LEGLFMOUNSIG Number of 3-legged unsignalized intersections with no left-turn movement from crossroad 21 0.00 1.00 0.05 0.22
NO4LEGFULLUNSIG Number of 4-legged full-movement unsignalized intersections 21 0.00 19.00 6.05 6.25
NO4LEGLIMUNSIG Number of 4-legged limited-movement unsignalized intersections 21 0.00 0.00 0.00 0.00
NO4LEGRIROUNSIG Number of 4-legged right-in/right-out unsignalized intersections 21 0.00 0.00 0.00 0.00
NO4LEGLFMOUNSIG Number of 4-legged left from major only unsignalized intersections 21 0.00 0.00 0.00 0.00
NORTLUNSIG Number of unsignalized intersections with a right-turn lane 21 0.00 19.00 3.57 5.46
NOLTLUNSIG Number of unsignalized intersections with a left-turn lane 21 0.00 18.00 2.43 4.07
NOSIG Number of signalized intersections 21 1.00 19.00 3.86 4.07
MINSPCSIG Minimum spacing of signalized intersections (feet) 16 301.00 6,538.00 1,896.00 1,606.00
MAXSPCSIG Maximum spacing of signalized intersections (feet) 16 504.00 13,545.00 3,767.00 3,142.00
NO3LEGSIG Number of 3-legged signalized intersections 21 0.00 4.00 0.43 0.98
NO4LEGSIG Number of 4-legged signalized intersections 21 1.00 15.00 3.43 3.41
NO5LEGSIG Number of 5-legged signalized intersections 21 0.00 0.00 0.00 0.00
NORTLSIG Number of signalized intersections with a right-turn lane on the mainline 21 0.00 11.00 2.29 2.41
NOLTLSIG Number of signalized intersections with a left-turn lane on the mainline 21 1.00 17.00 2.95 3.57
NOMEDOP Number of median openings 16 0.00 3.00 0.75 1.13
NOMEDOPLT Number of median openings with a left-turn lane 16 0.00 3.00 0.69 1.01
NOMEDOPNOLT Number of median openings without a left-turn lane 16 0.00 1.00 0.06 0.25
SPEED_LIMIT Posted speed limit (miles per hour) 21 30.00 55.00 41.00 8.54
AVGAADT Average AADT 21 5,423.00 70,333.00 18,397.00 16,092.00
SPCOFFLT Minimum spacing from off-ramp to available left turn onto mainline from same side of road (feet) 7 321.00 762.00 487.00 170.00
SPCOFFRT Minimum spacing from off-ramp to available right turn onto mainline from same side of road (feet) 7 321.00 762.00 460.00 179.00
SPCON Minimum spacing from on-ramp to available right turn onto mainline from same side of road (feet) 8 94.00 762.00 367.00 205.00
St. Dev. = standard deviation; TWLTL = two-way left-turn lane.

 

Table 85. Summary statistics for Northern California residential land use.

Variable Name Variable Description Corridors Minimum Maximum Mean St. Dev.
Total Total crashes/mile-year 17 0.19 36.77 15.75 10.49
Injury Injury crashes/mile-year 17 0.00 20.83 6.75 5.91
Turning Turning crashes/mile-year 17 0.00 17.18 4.81 4.10
Rear-end Rear-end crashes/mile-year 17 0.00 15.69 6.56 4.92
Right-angle Right-angle crashes/mile-year 17 0.00 6.67 1.79 1.97
PROPLANE1 Proportion of total length with two lanes 17 0.00 1.00 0.35 0.43
PROPLANE2 Proportion of total length with three or four lanes 17 0.00 1.00 0.46 0.45
PROPLANE3 Proportion of total length with five or more lanes 17 0.00 1.00 0.18 0.39
PROPDIV Proportion of total length with curb or raised concrete median 17 0.00 1.00 0.49 0.47
PROPTWLTL Proportion of total length with a TWLTL 17 0.00 0.97 0.11 0.26
PROPUNDIV Proportion of total length with an undivided median 17 0.00 1.00 0.40 0.43
PROPNODEV Proportion of total length with no adjacent development 17 0.00 0.33 0.06 0.13
PROPPARTDEV Proportion of total length with partial adjacent development 17 0.00 1.00 0.75 0.37
PROPFULLDEV Proportion of total length with full adjacent development 17 0.00 1.00 0.19 0.36
PROPLIGHT Proportion of total length with illumination present 17 0.00 1.00 0.46 0.47
PROPPOORPVMNT Proportion of total length with a poor pavement condition 17 0.00 0.00 0.00 0.00
PROPVC Proportion of total length with visual clutter 17 0.00 1.00 0.09 0.26
PROPLIMCONN Proportion of total length with limited connectivity on adjacent developments 17 0.00 1.00 0.54 0.47
PROPMODCONN Proportion of total length with moderate connectivity on adjacent developments 17 0.00 1.00 0.25 0.43
PROPSIGCONN Proportion of total length with significant connectivity on adjacent developments 17 0.00 1.00 0.21 0.39
PROPFRONTRD Proportion of total length with a frontage road 17 0.00 1.00 0.51 0.46
DRWYDENS Number of driveways per mile 17 0.00 135.52 25.45 35.88
UNSIGDENS Number of unsignalized intersections per mile 17 0.00 18.71 5.79 4.76
ACCDENS Number of driveways plus unsignalized intersections per mile 17 0.00 144.14 31.24 38.57
SIGDENS Number of signalized intersections per mile 17 0.00 9.09 2.46 2.20
MEDOPDENS Number of median openings per mile 16 0.00 12.30 1.65 3.13
NODRWYS Number of driveways 17 0.00 393.00 65.00 98.03
NOCOMFULLDRWY Number of commercial full-movement driveways 17 0.00 35.00 5.35 9.10
NORESFULLDRWY Number of residential full-movement driveways 17 0.00 358.00 40.12 90.09
NOCOMLIMDRWY Number of commercial limited-movement driveways 17 0.00 59.00 8.88 15.71
NORESLIMDRWY Number of residential limited-movement driveways 17 0.00 83.00 10.65 22.23
NOUNSIG Number of unsignalized intersections 17 0.00 42.00 14.24 12.64
NO3LEGUNSIG Number of 3-legged unsignalized intersections 17 0.00 36.00 11.29 10.68
NO4LEGUNSIG Number of 4-legged unsignalized intersections 17 0.00 14.00 2.88 3.77
NO5LEGUNSIG Number of 5-legged unsignalized intersections 17 0.00 1.00 0.06 0.24
NO3LEGFULLUNSIG Number of 3-legged full-movement unsignalized intersections 17 0.00 27.00 8.24 8.04
NO3LEGLIMUNSIG Number of 3-legged limited-movement unsignalized intersections 17 0.00 27.00 3.06 6.67
NO3LEGRIROUNSIG Number of 3-legged right-in/right-out unsignalized intersections 17 0.00 25.00 2.82 6.25
NO3LEGLFMOUNSIG Number of 3-legged unsignalized intersections with no left-turn movement from crossroad 17 0.00 2.00 0.18 0.53
NO4LEGFULLUNSIG Number of 4-legged full-movement unsignalized intersections 17 0.00 14.00 2.88 3.77
NO4LEGLIMUNSIG Number of 4-legged limited-movement unsignalized intersections 17 0.00 0.00 0.00 0.00
NO4LEGRIROUNSIG Number of 4-legged right-in/right-out unsignalized intersections 17 0.00 0.00 0.00 0.00
NO4LEGLFMOUNSIG Number of 4-legged unsignalized intersections with no left-turn movement from crossroad 17 0.00 0.00 0.00 0.00
NORTLUNSIG Number of unsignalized intersections with a right-turn lane 17 0.00 4.00 0.94 1.09
NOLTLUNSIG Number of unsignalized intersections with a left-turn lane 17 0.00 25.00 7.65 7.42
NOSIG Number of signalized intersections 17 0.00 24.00 5.88 5.86
MINSPCSIG Minimum spacing of signalized intersections (feet) 14 109.00 4,471.00 1,677.00 1,658.00
MAXSPCSIG Maximum spacing of signalized intersections (feet) 14 702.00 7,265.00 3,960.00 1,829.00
NO3LEGSIG Number of 3-legged signalized intersections 17 0.00 6.00 1.35 2.03
NO4LEGSIG Number of 4-legged signalized intersections 17 0.00 20.00 4.47 4.81
NO5LEGSIG Number of 5-legged signalized intersections 17 0.00 1.00 0.06 0.24
NORTLSIG Number of signalized intersections with a right-turn lane on the mainline 17 0.00 8.00 2.53 2.55
NOLTLSIG Number of signalized intersections with a left-turn lane on the mainline 17 0.00 23.00 4.06 5.61
NOMEDOP Number of median openings 16 0.00 19.00 3.31 5.20
NOMEDOPLT Number of median openings with a left-turn lane 16 0.00 19.00 2.94 4.89
NOMEDOPNOLT Number of median openings without a left-turn lane 16 0.00 4.00 0.38 1.02
SPEED_LIMIT Posted speed limit (miles per hour) 17 25.00 55.00 42.00 9.34
AVGAADT Average AADT 17 10,300.00 69,847.00 26,490.00 13,97.002
SPCOFFLT Minimum spacing from off-ramp to available left turn onto mainline from same side of road (feet) 3 183.00 662.00 364.00 260.00
SPCOFFRT Minimum spacing from off-ramp to available right turn onto mainline from same side of road (feet) 3 49.00 662.00 319.00 313.00
SPCON Minimum spacing from on-ramp to available right turn onto mainline from same side of road (feet) 1 383.00 383.00 383.00
St. Dev. = standard deviation; TWLTL = two-way left-turn lane; —Not applicable.

 

Table 86. Summary statistics for Southern California residential land use.

Variable Name Variable Description Corridors Minimum Maximum Mean St. Dev.
Total Total crashes/mile-year 13 4.15 51.13 19.39 14.47
Injury Injury crashes/mile-year 13 1.57 21.51 8.05 5.64
Turning Turning crashes/mile-year 13 1.04 10.77 5.30 3.13
Rear-end Rear-end crashes/mile-year 13 2.07 35.50 9.34 9.55
Right-angle Right-angle crashes/mile-year 13 0.00 4.04 1.51 1.21
PROPLANE1 Proportion of total length with two lanes 13 0.00 1.00 0.18 0.37
PROPLANE2 Proportion of total length with three or four lanes 13 0.00 1.00 0.66 0.47
PROPLANE3 Proportion of total length with five or more lanes 13 0.00 1.00 0.16 0.37
PROPDIV Proportion of total length with curb or raised concrete median 13 0.00 1.00 0.31 0.44
PROPTWLTL Proportion of total length with a TWLTL 13 0.00 1.00 0.42 0.43
PROPUNDIV Proportion of total length with an undivided median 13 0.00 1.00 0.27 0.36
PROPNODEV Proportion of total length with no adjacent development 13 0.00 0.58 0.05 0.16
PROPPARTDEV Proportion of total length with partial adjacent development 13 0.00 1.00 0.69 0.41
PROPFULLDEV Proportion of total length with full adjacent development 13 0.00 1.00 0.25 0.40
PROPLIGHT Proportion of total length with illumination present 13 0.00 1.00 0.62 0.45
PROPPOORPVMNT Proportion of total length with a poor pavement condition 13 0.00 0.00 0.00 0.00
PROPVC Proportion of total length with visual clutter 13 0.00 1.00 0.21 0.38
PROPLIMCONN Proportion of total length with limited connectivity on adjacent developments 13 0.00 1.00 0.81 0.31
PROPMODCONN Proportion of total length with moderate connectivity on adjacent developments 13 0.00 1.00 0.19 0.31
PROPSIGCONN Proportion of total length with significant connectivity on adjacent developments 13 0.00 0.00 0.00 0.00
PROPFRONTRD Proportion of total length with a frontage road 13 0.00 1.00 0.55 0.46
DRWYDENS Number of driveways per mile 13 0.00 85.71 19.62 21.98
UNSIGDENS Number of unsignalized intersections per mile 13 0.61 14.29 6.76 4.42
ACCDENS Number of driveways plus unsignalized intersections per mile 13 0.61 100.00 26.38 25.42
SIGDENS Number of signalized intersections per mile 13 0.00 2.56 1.86 0.80
MEDOPDENS Number of median openings per mile 5 0.00 3.17 1.44 1.24
NODRWYS Number of driveways 13 0.00 123.00 31.46 33.76
NOCOMFULLDRWY Number of commercial full-movement driveways 13 0.00 88.00 15.54 25.51
NORESFULLDRWY Number of residential full-movement driveways 13 0.00 32.00 10.77 12.09
NOCOMLIMDRWY Number of commercial limited-movement driveways 13 0.00 12.00 3.00 4.40
NORESLIMDRWY Number of residential limited-movement driveways 13 0.00 26.00 2.15 7.17
NOUNSIG Number of unsignalized intersections 13 1.00 34.00 11.92 10.05
NO3LEGUNSIG Number of 3-legged unsignalized intersections 13 1.00 33.00 9.54 8.94
NO4LEGUNSIG Number of 4-legged unsignalized intersections 13 0.00 9.00 2.31 2.53
NO5LEGUNSIG Number of 5-legged unsignalized intersections 13 0.00 1.00 0.08 0.28
NO3LEGFULLUNSIG Number of 3-legged full-movement unsignalized intersections 13 0.00 27.00 8.23 8.08
NO3LEGLIMUNSIG Number of 3-legged limited-movement unsignalized intersections 13 0.00 6.00 1.31 2.29
NO3LEGRIROUNSIG Number of 3-legged right-in/right-out unsignalized intersections 13 0.00 6.00 1.31 2.29
NO3LEGLFMOUNSIG Number of 3-legged left from major only unsignalized intersections 13 0.00 0.00 0.00 0.00
NO4LEGFULLUNSIG Number of 4-legged full-movement unsignalized intersections 13 0.00 9.00 2.31 2.53
NO4LEGLIMUNSIG Number of 4-legged limited-movement unsignalized intersections 13 0.00 0.00 0.00 0.00
NO4LEGRIROUNSIG Number of 4-legged right-in/right-out unsignalized intersections 13 0.00 0.00 0.00 0.00
NO4LEGLFMOUNSIG Number of 4-legged left from major only unsignalized intersections 13 0.00 0.00 0.00 0.00
NORTLUNSIG Number of unsignalized intersections with a right-turn lane 13 0.00 3.00 0.31 0.85
NOLTLUNSIG Number of unsignalized intersections with a left-turn lane 13 1.00 25.00 8.62 8.04
NOSIG Number of signalized intersections 13 0.00 7.00 3.31 1.93
MINSPCSIG Minimum spacing of signalized intersections (feet) 11 258.00 5,541.00 1,839.00 1,500.00
MAXSPCSIG Maximum spacing of signalized intersections (feet) 11 817.00 17,546.00 4,241.00 4,580.00
NO3LEGSIG Number of 3-legged signalized intersections 13 0.00 2.00 0.85 0.90
NO4LEGSIG Number of 4-legged signalized intersections 13 0.00 5.00 2.46 1.71
NO5LEGSIG Number of 5-legged signalized intersections 13 0.00 0.00 0.00 0.00
NORTLSIG Number of signalized intersections with a right-turn lane on the mainline 13 0.00 5.00 1.62 1.56
NOLTLSIG Number of signalized intersections with a left-turn lane on the mainline 13 0.00 7.00 3.08 1.98
NOMEDOP Number of median openings 5 0.00 3.00 1.60 1.14
NOMEDOPLT Number of median openings with a left-turn lane 5 0.00 2.00 1.40 0.89
NOMEDOPNOLT Number of median openings without a left-turn lane 5 0.00 1.00 0.20 0.45
SPEED_LIMIT Posted speed limit (miles per hour) 13 40.00 55 47 5.55
AVGAADT Average AADT 13 15,358.00 76,837.00 32,706.00 18,835.00
SPCOFFLT Minimum spacing from off-ramp to available left turn onto mainline from same side of road (feet) 0
SPCOFFRT Minimum spacing from off-ramp to available right turn onto mainline from same side of road (feet) 0
SPCON Minimum spacing from on-ramp to available right turn onto mainline from same side of road (feet) 0
St. Dev. = standard deviation; TWLTL = two-way left-turn lane; —Not applicable.

 

 

Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000
Turner-Fairbank Highway Research Center | 6300 Georgetown Pike | McLean, VA | 22101